US3605085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake lining wear detection means
Assignee: Individual
•
Filing: 1969-08-18
•
Granted: 1971-09-14
•
Expires: 1989-08-18
Abstract
Abstract Brake lining wear detection means to indicate when the brake lining on a motor vehicle brake assembly, either the conventional type or disc type, has worn to a preselected wear limit indicative of replacement wherein there is provided limit switch means in the detection circuit and mounted on the vehicle brake assembly in adjacent spaced relation relative to a brakeshoe in the brake assembly to operate the detection circuit when the brake lining wear has reached the preselected wear limit.
Inventors
- 👤 John L Fiorita
- 👤 Harold H Shaffer Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:05
CPC Classifications
F; F16; F16D; F16D51/00; F16D51/46; F16D51/48; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/561; F16D65/565; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/023
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
188 words
In a vehicle brake assembly, a brakeshoe lining wear detection means to indicate when the brake lining has worn to a preselected wear limit indicative of lining replacement comprising a brakeshoe assembly mounted in a support housing and having a brake lining secured to a brakeshoe movable a sufficient distance within said brake assembly to achieve brake application with the lining in frictional engagement with a brake engaging member, said detection means characterized by a limit switch means secured relative to said support housing and having a movable actuator positioned contiguous to said brakeshoe assembly in a manner to be sensitive to the forward and rearward movement of said brakeshoe relative to said support housing in applying said brake lining to said brake engaging member, said actuator having a travel distance from its open contact position to its closed contact position respectively equal to the difference in brake lining depth when the lining is new and when the lining is worn to said preselected wear limit, and an electrical detecting circuit electrically connected to said limit switch means operative when said actuator is in its closed contact position.
Claim 2
Dependent Claim
188 words
In a vehicle brake assembly, a brakeshoe lining wear detection means to indicate when the brake lining has worn to a preselected wear limit indicative of lining replacement comprising a brakeshoe assembly mounted in a support housing and having a brake lining secured to a brakeshoe movable a sufficient distance within said brake assembly to achieve brake application with the lining in frictional engagement with a brake engaging member, said detection means characterized by a limit switch means secured relative to said support housing and having a movable actuator positioned contiguous to said brakeshoe assembly in a manner to be sensitive to the forward and rearward movement of said brakeshoe relative to said support housing in applying said brake lining to said brake engaging member, said actuator having a travel distance from its open contact position to its closed contact position respectively equal to the difference in brake lining depth when the lining is new and when the lining is worn to said preselected wear limit, and an electrical detecting circuit electrically connected to said limit switch means operative when said actuator is in its closed contact position.
Claim 3
Dependent Claim
118 words
In the vehicle brake assembly of claim 1, characterized in that said brakeshoe assembly consists of a pair of oppositely disposed brakeshoes with attached linings pivotally operative to achieve brake application with their brake linings in frictional engagement with a brakedrum comprising said brake-engaging member, brake-adjusting means operatively connected to one end of each of said brakeshoes and adapted to adjust said brakeshoes for proper alignment relative to said brakedrum to compensate for progressive wear of said brakeshoe linings, said limit switch means mounted on said support housing with said actuator positioned to be contiguous to at least one of said brakeshoe assemblies to operate said electrical detection circuit upon brake lining wear reaching said preselected wear limit.
Claim 4
Dependent Claim
70 words
In the vehicle brake assembly of claim 2, characterized in that said switch means actuator is an outwardly spring-biased plunger within a switch housing mounted on the support housing with the outer end of its plunger engaging the surface of one of said brakeshoes, said plunger extended its full length from within said switch housing to operate said electrical detection circuit upon brake lining wear reaching said preselected wear limit.
Claim 5
Dependent Claim
67 words
In the vehicle brake assembly of claim 2, characterized in that said switch means actuator is a toggle with its switch housing mounted on said support housing with said toggle secured by linking means to one of said brakeshoes, said toggle placed in its closed position to operate said electrical detection circuit upon application of said brakeshoe assembly upon brake lining wear reaching said preselected wear limit.
Claim 6
Dependent Claim
96 words
In the vehicle brake assembly of claim 2, characterized in that said brake-adjusting means comprises a brakeshoe adjusting screw assembly consisting of a threaded stud section and a hollow threaded nut section, a spring-biased plunger switch comprising said limit switch means housed in the bottom of said hollow threaded nut section with the outer end of its plunger placed in its closed position to operate said electrical detection circuit when said stud section is threadably adjusted outwardly of said nut section in performing said shoe-drum alignment indicative of brake lining wear reaching said preselected wear limit.
Claim 7
Dependent Claim
19 words
In the vehicle brake assembly of claim 5, characterized in that said brake-adjusting means is of the self-adjusting type.
Claim 8
Dependent Claim
114 words
In the brakeshoe assembly of claim 1, characterized in that said brakeshoe assembly comprises a pair of oppositely disposed brakeshoes with attached linings secured within a caliper housing comprising said support housing and reciprocally operative toward one another by pairs of oppositely disposed piston means to achieve brake application with their brake linings in frictional engagement with a brake disc comprising said brake engaging member positioned within and between said brake linings, said limit switch means mounted within said caliper housing with said actuator positioned to be contiguous to one of said brakeshoes through one of said piston means to operate said electrical detection circuit upon brake lining wear reaching said preselected wear limit.
Claim 9
Dependent Claim
65 words
In the vehicle brake assembly of claim 7, characterized by fluid-operated brake pistons mounted for reciprOcation in said caliper housing to engage said brakeshoes, said limit switch means mounted on the rear of at least one of said pistons with said actuator positioned to be contiguous to said caliper housing to operate said electrical detection circuit upon brake lining wear reaching said preselected wear limit.
Claim 10
Dependent Claim
146 words
In a vehicle brake assembly, a brake lining wear detection means to indicate when the brake lining is worn to a preselected wear limit indicative of replacement comprising a brakeshoe assembly consisting of a pair of oppositely disposed brakeshoes and a brake lining secured to each of said brakeshoe and movable a sufficient distance to achieve brake application with the brake linings in frictional engagement with a brakedrum, self-adjusting brake means secured within said brake assembly and adapted to adjust said brakeshoes for proper alignment relative to the brakedrum to compensate for progressive wear of the brakeshoe lining, said brake lining wear detection means characterized by limit switch means mounted in said self-adjusting brake means to complete and permit operation of said detection circuit when said self-adjusting brake means has adjusted for said brake shoe-drum alignment indicative of brake lining wear reaching said preselected wear limit.
Claim 11
Dependent Claim
146 words
In a vehicle brake assembly, a brake lining wear detection means to indicate when the brake lining is worn to a preselected wear limit indicative of replacement comprising a brakeshoe assembly consisting of a pair of oppositely disposed brakeshoes and a brake lining secured to each of said brakeshoe and movable a sufficient distance to achieve brake application with the brake linings in frictional engagement with a brakedrum, self-adjusting brake means secured within said brake assembly and adapted to adjust said brakeshoes for proper alignment relative to the brakedrum to compensate for progressive wear of the brakeshoe lining, said brake lining wear detection means characterized by limit switch means mounted in said self-adjusting brake means to complete and permit operation of said detection circuit when said self-adjusting brake means has adjusted for said brake shoe-drum alignment indicative of brake lining wear reaching said preselected wear limit.
References Cited (Backward Citations)
US3282241A
Cited
US3321045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |